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Post by alexb1406 on Dec 15, 2011 23:49:20 GMT
Can someone tell me what is the correct type of wiper motor for a Mk1? - pre-rheostat. There is nothing actually wrong with mine but I found out after about 10 years of ownership that the motor fitted is a two speed unit wired up to work only on fast speed- a Lucas 6WA. I guess this is wrong and I may one day fit the correct one if I can find one, but after an idea I had to fit intermittent wipers to the system that I have now put on hold due to this, I would first like to resolve these few queries that are niggling me.
I have searched this forum and the net but have found virtually nothing on Rover P5 wiper motors! The little information that is available here all relates to the later motor with the rheostat.
1. First question is the type of wiper motor.
2. Is it a one-speed motor?
3. Does it have a reverse parking system to park the blades off the screen?
4. Is the later motor fitted to the P5B a two speed motor? (Lucas 6W on my other car) I know the rheostat controls the speed - my guess is that the rheostat is connected to a centre tapping on the field coils that would make it a two speed motor if the rheostat was removed but can anyone confirm this?
Once I have the correct motor I may get round to designing the intermittent system that started all this off.
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Post by Phil Nottingham on Dec 16, 2011 0:02:30 GMT
Rover fitted 2 speed units to P4 and P5 at that time but only used 1 speed which was optional as to which was wanted
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Post by alexb1406 on Dec 16, 2011 0:26:20 GMT
Now why doesn't that surprise me?!?
I still think there is something not right with mine as I didn't mention earlier that there are 5 wires on the switch - exactly as the wiring diagram, but at the motor end 3 of those are not connected - the motor doesn't have enough wires for them! The only one unconnected wire on the motor is for the slow speed.
Also, the motor sweeps all the way down and off the screen with every stroke - there is no way the wipers could be repositioned as they would go off the screen at the other end, so this is why I asked the question whether the motor should reverse to park the wipers - this one does not!
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Post by Phil Nottingham on Dec 16, 2011 18:12:49 GMT
It should reverse park and it should have extra cables - having said that many faults with reverse parking is just down to adjustment (knurled nut) and/or sticking/dry wiper rack
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Post by johnwp5bcoupe on Dec 16, 2011 19:43:53 GMT
Red Wire connected ok?
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Post by Warwick on Dec 16, 2011 22:54:53 GMT
Sounds like a good time to ask a question.
How does the reverse parking work? I guess when I dismantle the wiper motor gearbox one day to grease it, I'll find out. But in the meantime, I can't think of how it does it.
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Post by alexb1406 on Dec 17, 2011 16:18:35 GMT
The motor has 4 wires coming out of it. According to the wiring diagram it should have 6 which is why I suspect I have the wrong motor. 1. Earth - black 2. Green live from fuse (-ve as car is positive earth) 3. Red (I think as colour is faded) to switch 4. One additional wire, colour unknown, disconnected. Makes motor run at slow speed when connected together with no 3. From the switch GW, GN and GU wires are loose at the motor end. The only wire connected is the GR to wire no 3 and provides an earth to the motor via the switch to turn it on. I can't see any way of making this motor run in reverse without taking it apart to examine the wiring a little closer. Before I do that I'm hoping someone may tell me whether it is the correct type of motor - Lucas 6WA. Sounds like a good time to ask a question. How does the reverse parking work? I guess when I dismantle the wiper motor gearbox one day to grease it, I'll find out. But in the meantime, I can't think of how it does it. Warwick - electrically the switch reverses polarity to either the field or armature of the motor (not both!) and either + or - (not sure which) is supplied through the park switch to switch it off in the correct position. Mechanically I'm not sure - I've had some Jag motors apart many years ago but I can't remember exactly how it was achieved though I'm sure it will be apparent once you take the motor apart - I guess it may guide the rack on the gearwheel into a different position as it works backwards. |
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Post by Warwick on Dec 19, 2011 2:02:09 GMT
Thanks Alex.
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